Integrate Openfeint into cocos2d-x for android

cocos2d-x C++
#1

Hello,

I read Simon Lin’s guide on how to integrate openfeint into android (http://blog.molioapp.com/2011/11/openfeint-and-admob-integrated-with.html) and I got the gist of it:

~~Call a JNI function from Java side which allows JNI to save the JNIEnv for later use in c++
~~c++ calls the JNI functions with the saved-in-memory JNIEnv variables.
-JNI calls Java, which calls the openfeint SDK and API.

But I do not get how does cocos2dx call the JNI functions (step two). In the guide, they had it defined as static methods in a class, but how do you reference it from your cocos2d-x games? Am I missing something in the Android .mk files? I do not know how to make them connect together (cocos2d-x and JNI). Can anyone help me with this?

Thanks!

#2

In cocos2d-x 0.12, look at main.cpp on cocos2d-x project/androi/jni/helloworld/, you can see:

#include "platform/android/jni/JniHelper.h"
#include

I use it, and create a RunJava.cpp :
Set include:

#if CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID
#include "platform/android/jni/JniHelper.h"
#include 
#define CLASS_OPEN_NAME "org/cocos2dx/lib/OpenFeintUtils"
#endif

And call java function:

void OpenFeint::showLeaderboard()
{
    #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
    JniMethodInfo methodInfo;
    if (! JniHelper::getStaticMethodInfo(methodInfo, CLASS_OPEN_NAME, "showLeaderboard", "()V"))
    {
        CCLog("Can't not find static method showLeadboard");
        return;
    }

    methodInfo.env->CallStaticVoidMethod(methodInfo.classID, methodInfo.methodID);
    methodInfo.env->DeleteLocalRef(methodInfo.classID);
    #else
    CCLog("click show");
    #endif
}

Just do it. You must creat OpenFeintUtils.java with method “showLeaderboard”.
Only need to include “JniHelper.h” and “jni.h”, and you can call java method like me

#3

Thanks for your reply!

So you do not need to add your RunJava.cpp to Android.mk or anything because of the JniHelper.h and jni.h?

#4

of course, you need to add RunJava.cpp to Android.mk to make Cygwin build it.
Don’t need anything more with JniHelper.h and jni.h

#5

It’s good to see the new cocos2d-1.0.1-x-0.12.0 do much things about JNI calling.

If you don’t want to re-write all the codes, you can refer my another post about this.

I just faced this new JniHelper architecture and already adopt to it.

Here is the reference link :